CN102892247A - Method and circuit for improving crest factor of gas discharge lamp - Google Patents
Method and circuit for improving crest factor of gas discharge lamp Download PDFInfo
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- CN102892247A CN102892247A CN2011102014293A CN201110201429A CN102892247A CN 102892247 A CN102892247 A CN 102892247A CN 2011102014293 A CN2011102014293 A CN 2011102014293A CN 201110201429 A CN201110201429 A CN 201110201429A CN 102892247 A CN102892247 A CN 102892247A
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
- H05B41/14—Circuit arrangements
- H05B41/26—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc
- H05B41/28—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters
- H05B41/282—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters with semiconductor devices
- H05B41/285—Arrangements for protecting lamps or circuits against abnormal operating conditions
- H05B41/2858—Arrangements for protecting lamps or circuits against abnormal operating conditions for protecting the lamp against abnormal operating conditions
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
- H05B41/14—Circuit arrangements
- H05B41/26—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc
- H05B41/28—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters
- H05B41/282—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters with semiconductor devices
- H05B41/2825—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters with semiconductor devices by means of a bridge converter in the final stage
- H05B41/2828—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters with semiconductor devices by means of a bridge converter in the final stage using control circuits for the switching elements
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Abstract
The invention discloses a method and a circuit for improving a crest factor of a gas discharge lamp, which have the characteristics of improving the crest factor of the gas discharge lamp in a use process and prolonging the service life of the gas discharge lamp. The technical scheme is as follows: the method comprises the following steps of: sampling a judgment signal of the gas discharge lamp; judging whether the gas discharge lamp is in a preheating stage or a constant power stage according to the size relationship between the judgment signal and a preset value; selecting a preset parameter according to the stage of the gas discharge lamp; selecting a first parameter when the gas discharge lamp is in the preheating stage; selecting a second parameter when the gas discharge lamp is in the constant power stage; and outputting a control signal according to the selected first parameter or the second parameter when the current of the gas discharge lamp is commutated, thereby improving the crest factor of the gas discharge lamp.
Description
Technical field
The present invention relates to improve in a kind of gaseous discharge lamp (gas discharge lamp) crest factor (CF, Crest Factor) technology relates in particular to the Method and circuits that improves crest factor in the gaseous discharge lamp by reducing gaseous discharge lamp at the peak current of electric current commutation (lamp current commutation).
Background technology
Fig. 1 shows the principle of traditional gaseous discharge lamp.See also Fig. 1, the main circuit of traditional gaseous discharge lamp will comprise power factor correction circuit 10 (PFC, Power Factor Circuit), DC to DC converter 12 (DC/DC converter), inverter 14 (Inverter).The three is the relation that sequentially connects, and the output of inverter 14 connects gaseous discharge lamp 16.
As shown in Figure 1, DC to DC converter 12 provides suitable power energy for gaseous discharge lamp, and inverter 14 provides the square wave voltage signal of low frequency (for example 150Hz) for gaseous discharge lamp, and these all are prior aries, do not repeat them here.
It is crest factor (peak current of gaseous discharge lamp and the ratio of effective current) that a parameter is arranged in gaseous discharge lamp, and crest factor is the important parameter that affects the gaseous discharge lamp life-span.Crest factor numerical value in the ideal situation is 1, but because peak current is often greater than effective current in actual the use, so crest factor numerical value in actual use is greater than 1.
If the numerical value of crest factor is larger, illustrate that then its peak current is higher, easily cause the electrode damage of gaseous discharge lamp, thereby reduce the useful life of gaseous discharge lamp.Therefore, in the circuit of gaseous discharge lamp, need auxiliary circuit of design, for reducing the peak value circuit, the control crest factor makes its numerical value near ideal value.
Summary of the invention
The object of the invention is near the problems referred to above, the method for improving crest factor in a kind of gaseous discharge lamp is provided, improve the crest factor in the gaseous discharge lamp use procedure, prolong the useful life of gaseous discharge lamp.
Another object of the present invention is to provide a kind of gas discharge lamp circuit that improves crest factor.
Another purpose of the present invention has been to provide the gas discharge lamp circuit of another kind of improvement crest factor.
Technical scheme of the present invention is: the present invention has disclosed the method for improving crest factor in a kind of gaseous discharge lamp, comprising:
Step 1: the judgement signal of sample gas discharge lamp;
Step 2: judge that according to the magnitude relationship of judging signal and preset value the current residing stage of gaseous discharge lamp is warm-up phase or permanent power phase;
Step 3: according to the default parameter of the residing stage selection of gaseous discharge lamp, when gaseous discharge lamp is in warm-up phase, select the first parameter, when gaseous discharge lamp is in permanent power phase, select the second parameter;
Step 4: when the gas discharge lamp current commutates, export control signal according to selected described the first parameter or described the second parameter, to improve the crest factor of gaseous discharge lamp.
According to an embodiment who improves the method for crest factor in the gaseous discharge lamp of the present invention, described judgement signal is the signal of reflection lamp state or the signal of reflection lamp power.
According to an embodiment who improves the method for crest factor in the gaseous discharge lamp of the present invention, the signal of described reflection lamp state comprises modulating voltage or the circuit duty ratio of gaseous discharge lamp, and the signal of described reflection lamp power comprises the lamp power of gaseous discharge lamp, system's input power or system's power output.
According to an embodiment who improves the method for crest factor in the gaseous discharge lamp of the present invention, step 4 comprises:
According to selected described the first parameter or the second parameter output the second or the 3rd given value of current signal;
Hold time according to selected described the first parameter or the second parameter;
Export the first given value of current signal.
According to an embodiment who improves the method for crest factor in the gaseous discharge lamp of the present invention, step 4 comprises:
According to selected described the first parameter or the second parameter output the second or the 3rd current feedback signal;
Hold time according to selected described the first parameter or the second parameter;
Export the first current feedback signal.
According to an embodiment who improves the method for crest factor in the gaseous discharge lamp of the present invention, step 4 comprises:
DC to DC converter in the forbidden energy gas discharge lamp circuit;
According to selected described the first parameter or the different time-delay of the second parameter output;
Enable described DC to DC converter according to the time-delay of exporting.
According to an embodiment who improves the method for crest factor in the gaseous discharge lamp of the present invention, described judgement signal is the rolling counters forward signal.
The present invention has also disclosed a kind of gas discharge lamp circuit that improves crest factor, comprises DC to DC converter, inverter, judgement signal sample circuit, digital processing chip and control unit, wherein:
Electric current or the watt level of described DC to DC converter control gaseous discharge lamp;
Described inverter couples described DC to DC converter, carries out direct current to the conversion of alternating current;
Described judgement signal sample circuit gathers gaseous discharge lamp and judges signal;
Described digital processing chip, couple described judgement signal sample circuit, judge that according to the magnitude relationship of the judgement signal that samples and preset value the current residing stage of gaseous discharge lamp is warm-up phase or permanent power phase, when being in warm-up phase, gaseous discharge lamp selects the first parameter, when gaseous discharge lamp is in permanent power phase, select the second parameter, when the gas discharge lamp current commutates, export corresponding control signal to described control unit according to selected described the first parameter or the second parameter;
Described control unit couples described digital processing chip, improves the crest factor of gaseous discharge lamp according to described control signal.
Embodiment according to the gas discharge lamp circuit of improvement crest factor of the present invention, comprise power factor correction circuit, described power factor correction circuit, change different input ac voltages into constant or variable direct voltage, described power factor correction circuit output is coupled to the input of described DC to DC converter.
According to an embodiment of the gas discharge lamp circuit of improvement crest factor of the present invention, judge the sample output voltage of described direct current, DC converter of signal sample circuit.
According to an embodiment of the gas discharge lamp circuit of improvement crest factor of the present invention, judge that signal comprises the signal of reflection lamp state or the signal of reflection lamp power.
According to an embodiment of the gas discharge lamp circuit of improvement crest factor of the present invention, described digital processing chip comprises stage judging unit, parameter selection unit, control signal output unit, wherein:
Described stage judging unit judges that according to the magnitude relationship of the output voltage that samples and preset value the current residing stage of gaseous discharge lamp is warm-up phase or permanent power phase;
Described parameter selection unit connects described stage judging unit, selects the first parameter when gaseous discharge lamp is in warm-up phase, selects the second parameter when gaseous discharge lamp is in permanent power phase;
Described control signal output unit connects described parameter selection unit, exports corresponding control signal to described control unit when the gas discharge lamp current commutates according to selected described the first parameter or the second parameter.
The present invention has also disclosed a kind of gas discharge lamp circuit that improves crest factor, and comprise inverter, judge signal sample circuit, digital processing chip and control unit, wherein:
Described inverter is controlled electric current or the watt level of gaseous discharge lamp and is carried out direct current to the conversion of alternating current;
Described judgement signal sample circuit gathers gaseous discharge lamp and judges signal;
Described digital processing chip, couple described judgement signal sample circuit, judge that according to the magnitude relationship of the judgement signal that samples and preset value the current residing stage of gaseous discharge lamp is warm-up phase or permanent power phase, when being in warm-up phase, gaseous discharge lamp selects the first parameter, when gaseous discharge lamp is in permanent power phase, select the second parameter, when the gas discharge lamp current commutates, export corresponding control signal to described control unit according to selected described the first parameter or the second parameter;
Described control unit couples described digital processing chip, improves the crest factor of gaseous discharge lamp according to described control signal.
Gas discharge lamp circuit according to the described improvement crest factor of an embodiment of the gas discharge lamp circuit of improvement crest factor of the present invention comprises power factor correction circuit, described power factor correction circuit, change different input ac voltages into constant or variable direct voltage, described power factor correction circuit output is coupled to the input of described inverter.
According to an embodiment of the gas discharge lamp circuit of improvement crest factor of the present invention, the sample duty cycle signals of described inverter of described judgement signal sample circuit.
According to an embodiment of the gas discharge lamp circuit of improvement crest factor of the present invention, judge that signal comprises the signal of reflection lamp state or the signal of reflection lamp power.
According to an embodiment of the gas discharge lamp circuit of improvement crest factor of the present invention, described digital processing chip comprises stage judging unit, parameter selection unit, control signal output unit, wherein:
Described stage judging unit judges that according to the magnitude relationship of the duty cycle signals that samples and preset value the current residing stage of gaseous discharge lamp is warm-up phase or permanent power phase;
Described parameter selection unit connects described stage judging unit, selects the first parameter when gaseous discharge lamp is in warm-up phase, selects the second parameter when gaseous discharge lamp is in permanent power phase;
Described control signal output unit connects described parameter selection unit, exports corresponding control signal to described control unit when the gas discharge lamp current commutates according to selected described the first parameter or the second parameter.
Count signal according to the described judgement signal sample circuit of the embodiment sample counter of the gas discharge lamp circuit of improvement crest factor of the present invention.
Count signal according to the described judgement signal sample circuit of another embodiment sample counter of the gas discharge lamp circuit of improvement crest factor of the present invention.
The present invention contrasts prior art following beneficial effect: technical scheme of the present invention is to select different parameters for the residing stage of gaseous discharge lamp (namely be in the warm-up phase of constant current or be in permanent power phase), export corresponding control signal according to two different parameters, to improve crest factor.The contrast prior art, the present invention mainly is the different control parameter of different phase employing at gaseous discharge lamp, is to realize controlling more accurately.
Description of drawings
Fig. 1 is the schematic diagram of traditional gaseous discharge lamp.
Fig. 2 A is the schematic diagram of the first embodiment of the gas discharge lamp circuit of improvement crest factor of the present invention.
Fig. 2 B is the refinement schematic diagram of Fig. 2 A embodiment.
Fig. 2 C is another refinement schematic diagram of Fig. 2 A embodiment.
Fig. 3 is the schematic diagram of the second embodiment of the gas discharge lamp circuit of improvement crest factor of the present invention.
Fig. 4 is the refinement schematic diagram of digital processing chip of the present invention.
Fig. 5 is the control flow chart of digital processing chip of the present invention.
Fig. 6 is the flow chart of the first embodiment of the method for improvement crest factor in the gaseous discharge lamp of the present invention.
Fig. 7 is the flow chart of the second embodiment of the method for improvement crest factor in the gaseous discharge lamp of the present invention.
Fig. 8 is the flow chart of the 3rd embodiment of the method for improvement crest factor in the gaseous discharge lamp of the present invention.
Fig. 9 A is the schematic diagram of forbidden energy/enabled current source of the present invention.
Fig. 9 B is control signal waveform schematic diagram corresponding to Fig. 9 A.
Figure 10 A is the schematic diagram of minimizing current source of the present invention.
Figure 10 B is control signal waveform schematic diagram corresponding to Figure 10 A.
Embodiment
The invention will be further described below in conjunction with drawings and Examples.
Improve the first embodiment of the gas discharge lamp circuit of crest factor
Fig. 2 A shows the principle of the first embodiment of the gas discharge lamp circuit of improvement crest factor of the present invention.See also Fig. 2 A, the gas discharge lamp circuit of the present embodiment comprises power factor correction circuit 20, DC to DC converter, inverter 22, judges signal sample circuit 24, digital processing chip 26 and control unit 28.
The annexation of these modules is: the input signal of judging signal sample circuit 24 can be the signals such as output voltage that the signal of reflection lamp state comprises modulating voltage, circuit duty ratio or the described DC to DC converter of gaseous discharge lamp, also can be the signals such as lamp power, system's input power or system's power output that the signal of reflection lamp power comprises gaseous discharge lamp, also can be the signals such as count signal (its Counter also comprises timer) of counter, also can be the signal of other reaction lamp states.The output of the input connection judgment signal sample circuit 24 of digital processing chip 26, the input of control unit 28 connects the output of digital processing chip 26.The output of control unit 28 is couple to DC to DC converter.
Power factor correction circuit 20, usually adopt booster type (Boost) circuit, it also can be other buck (Buck-Boost) circuit, inverse-excitation type (Flyback) circuit etc., change different input ac voltages into constant or variable direct voltage, and improve the waveform of input current, reduce the harmonic wave of input current, realize the high power factor of circuit, reduce the harmonic pollution to electrical network.
DC to DC converter is mainly realized the electric current of lamp or the control of watt level.Different phase after lamp is lighted, by size and the waveform of the different lamp current of dc dc converter control, or different lamp watt levels.DC to DC converter can be the topological structures such as voltage-dropping type (buck), half-bridge (half bridge), inverse-excitation type variator (flyback) usually.DC to DC converter among Fig. 2 is buck convertor.
Judge that signal sample circuit 24 gathers the judgement signal of described gaseous discharge lamp.The acquisition target of judging signal sample circuit 24 is the signal of reflection lamp state, the signal that for example reflects modulating voltage, as modulating voltage, circuit duty ratio or as described in the signals such as output voltage of DC to DC converter, it also can be the signal of reflection lamp power, signals such as lamp power, system's input power, system's power output, also can be the count signal (its Counter also comprises timer) of counter, also can be the signal of other reflection lamp states.
Judge that signal sampling module 24 illustrates as an example of the output voltage that gathers described DC to DC converter example.Inverter 22 shown in Fig. 2 A works in the operating state of low frequency inversion, and its output voltage is modulating voltage, and is approximate identical with the output voltage of DC to DC converter.Therefore the output voltage of sampling DC to DC converter can react the state of modulating voltage.
As shown in Figure 4, digital processing chip comprises stage judging unit, parameter selection unit, control signal output unit, is the relation that sequentially connects between these three unit.
The stage judging unit judges that according to the magnitude relationship of the output voltage that samples and preset value the current residing stage of gaseous discharge lamp is warm-up phase or permanent power phase.
In the parameter selection unit, when gaseous discharge lamp is in warm-up phase, select the first parameter, when gaseous discharge lamp is in permanent power phase, select the second parameter.
The control signal output unit is exported corresponding control signal to control unit 28 according to selected the first parameter or the second parameter when the gas discharge lamp current commutates.
Control unit 28 improves the crest factor of gaseous discharge lamp according to control signal.Concrete corrective measure be for for example can controlling the output current that reduces buck convertor, and the given signal by changing control unit 28 output currents or the feedback signal of current sample reduce the output current of buck convertor.Also can directly control control unit 28 work and idle time, when needs restarted control unit 28 work, sending controling unit 28 restarted the signal of work again.
And the inside principle of control unit 28 can have two kinds of implementations, the control unit 28a that the first realizes is shown in Fig. 2 B, and control unit 28a inside is comprised of lamp current sample circuit 280a, given value of current treatment circuit 282a, feedback processing circuit 284a and modulation circuit 286a.
At first, after judging that signal sample circuit 24a judges signal sampling, send into digital processing chip 26a and process, the output signal of digital processing chip 26a is as the input of sending into given value of current signal processing circuit 282a.Given value of current treatment circuit 282a is output as the given value of current signal, and control loop is so that the given signal of output follow current of circuit.
The control unit 28b that the second is realized is shown in Fig. 2 C, and control unit 28b inside is comprised of lamp current sample circuit 280b, given value of current treatment circuit 282b, feedback processing circuit 284b and modulation circuit 286b.
At first, after judging that signal sample circuit 24b judges signal sampling, send into digital processing chip 26b and process, the output signal of digital processing chip 26b is sent into feedback processing circuit 284b with the lamp current sampled signal, output feedback signal after processing.
Improve the second embodiment of the gas discharge lamp circuit of crest factor
Fig. 3 shows the principle of the second embodiment of the gas discharge lamp circuit of improvement crest factor of the present invention.See also Fig. 3, the gas discharge lamp circuit of the present embodiment comprises: rectifier 38, power factor correction circuit 37, inverter 35, driver 36, judgement signal sampling module 30, digital processing chip 32 and control unit 34.
The annexation of these modules is: judge that the output of signal sampling module 30 connects the input of digital processing chip 32, and the input of the output connection control unit 34 of digital processing chip 32, the output of control unit 34 is connected respectively to driver 36.
Power factor correction circuit 37, usually adopt booster type (Boost) circuit, it also can be other buck (Buck-Boost) circuit, inverse-excitation type (Flyback) circuit etc., change different input ac voltages into constant or variable direct voltage, and improve the waveform of input current, reduce the harmonic wave of input current, realize the high power factor of circuit, reduce the harmonic pollution to electrical network.
Judge the judgement signal of signal sampling module 30 described gaseous discharge lamps.The acquisition target of judging signal sample circuit 30 is the signal of reflection lamp state, the signal that for example reflects modulating voltage, such as signals such as modulating voltage, circuit duty ratios, it also can be the signal of reflection lamp power, signals such as lamp power, system's input power, system's power output, also can be the count signal (its Counter also comprises timer) of counter, also can be the signal of other reflection lamp states.
Judge that signal sampling module 30 illustrates as an example of the duty cycle signals that gathers gas discharge lamp circuit example.Shown in Figure 3 is the DC to DC converter of half bridge architecture, because the more difficult Direct Sampling of modulating voltage of half bridge architecture obtains, therefore needs the low-voltage signal of sampling circuit, i.e. duty ratio (duty) signal.Duty cycle signals is shown below in the line and a linear relationship is arranged between the output voltage:
Lamp?voltage＝(duty-0.5)×Vbus，
Because the Vbus voltage of pfc circuit output is generally more fixing, for example be 450V, so duty cycle signals also can reflect the state of modulating voltage.
As shown in Figure 4, digital processing chip comprises stage judging unit, parameter selection unit, control signal output unit, is the relation that sequentially connects between these three unit.
The stage judging unit judges that according to the magnitude relationship of the judgement signal that samples and preset value the current residing stage of gaseous discharge lamp is warm-up phase or permanent power phase.
In the parameter selection unit, when gaseous discharge lamp is in warm-up phase, select the first parameter, when gaseous discharge lamp is in permanent power phase, select the second parameter.
The control signal output unit is exported corresponding control signal to control unit 34 according to selected the first parameter or the second parameter when the gas discharge lamp current commutates.
Improve the first embodiment of the method for crest factor in the gaseous discharge lamp
Fig. 6 shows the flow process of the first embodiment of the method for improving crest factor in the gaseous discharge lamp of the present invention.See also Fig. 6, the below is the detailed description to each step in the method for the present embodiment.Entity circuit corresponding to the present embodiment is shown in Fig. 2 B.Please take the circuit shown in Fig. 2 B as implementing the basis, referring to following step.
Step S10: judge whether electric current commutates, if electric current commutates then enters step S11, otherwise flow process finishes.
Step S11: the judgement signal of sample gas discharge lamp.
Judge that the signals collecting object can be the signal of reflection lamp state, the signal that for example reflects modulating voltage, such as signals such as modulating voltage, circuit duty ratios, it also can be the signal of reflection lamp power, signals such as lamp power, system's input power, system's power output, also can be the count signal (its Counter also comprises timer) of counter, also can be the signal of other reflection lamp states.
Step S12: judge the signal collect and the magnitude relationship of set point, if signal greater than set point then enter step S14, otherwise enters step S13.
In this step, the magnitude relationship judgement current residing stage of gaseous discharge lamp that is actually according to sampled signal and preset value is warm-up phase or permanent power phase.
Because gaseous discharge lamp mainly is comprised of warm-up phase (Warm Up) and two time periods of permanent power phase, the regulative mode in this two stages is different, so need to carry out differentiated treatment to these two stages.
Step S13: select the first parameter.Select the first parameter when gaseous discharge lamp is current to be in warm-up phase judging.
Step S14: select the second parameter.Select the second parameter when gaseous discharge lamp is current to be in permanent power phase judging.
Step S15: according to selected described the first parameter or the second parameter output the second or the 3rd given value of current signal, i.e. the second given value of current signal corresponding to the first parameter, the 3rd given value of current signal that the second parameter is corresponding.
Step S16: hold time according to selected described the first parameter or the second parameter, wherein the first parameter can be different from the holding time of given value of current signal of the second parameter, also can be identical.
Step S17: output the first given value of current signal outside the holding time of the first parameter and the second parameter.
System can be according to the size of the given signal of lamp current, the size that the current regulation loops that the feedback signal by lamp current in the control system forms is regulated the control lamp current.The second given value of current signal can be identical with the 3rd given value of current signal, also can be different.Holding time mainly is time for control break given value of current signal function, holds time and the combination of suitable given value of current signal by suitable, can the current waveform of regulating and controlling lamp current when commutation, thus improve crest factor.
The principle correspondence of the present embodiment shown in 10A, according to lamp condition selecting parameter 1 or parameter 2, and according to parameter 1 or parameter 2 control when the commutation reduces current source, the relation of its signal is shown in Figure 10 B.
Improve the second embodiment of the method for crest factor in the gaseous discharge lamp
Fig. 7 shows the flow process of the second embodiment of the method for improving crest factor in the gaseous discharge lamp of the present invention.See also Fig. 7, the below is the detailed description to each step in the method for the present embodiment.Entity circuit corresponding to the present embodiment is shown in Fig. 2 C.Please take the circuit shown in Fig. 2 C as implementing the basis, referring to following step.
Step S20: judge whether electric current commutates, if electric current commutates then enters step S21, otherwise flow process finishes.
Step S21: the judgement signal of sample gas discharge lamp.
Judge that the signals collecting object can be the signal of reflection lamp state, the signal that for example reflects modulating voltage, such as signals such as modulating voltage, circuit duty ratios, it also can be the signal of reflection lamp power, signals such as lamp power, system's input power, system's power output, also can be the count signal (its Counter also comprises timer) of counter, also can be the signal of other reflection lamp states.
Step S22: judge the signal collect and the magnitude relationship of set point, if signal greater than set point then enter step S24, otherwise enters step S23.
In this step, the magnitude relationship judgement current residing stage of gaseous discharge lamp that is actually according to sampled signal and preset value is warm-up phase or permanent power phase.
Because gaseous discharge lamp mainly is comprised of warm-up phase (Warm Up) and two time periods of permanent power phase, the regulative mode in this two stages is different, so need to carry out differentiated treatment to these two stages.
Step S23: select the first parameter.Select the first parameter when gaseous discharge lamp is current to be in warm-up phase judging.
Step S24: select the second parameter.Select the second parameter when gaseous discharge lamp is current to be in permanent power phase judging.
Step S25: according to selected described the first parameter or the second parameter output the second or the 3rd current feedback signal, i.e. the second current feedback signal corresponding to the first parameter, the 3rd current feedback signal that the second parameter is corresponding.
Step S26: hold time according to selected described the first parameter or the second parameter, wherein the first parameter can be different from the holding time of current feedback signal of the second parameter, also can be identical.
Step S27: output the first current feedback signal outside the holding time of the first parameter and the second parameter.
System can be according to the size of the feedback signal of lamp current, the size that the current regulation loops that the given signal by lamp current in the control system forms is regulated the control lamp current.The second current feedback signal can be identical with the 3rd current feedback signal, also can be different.Holding time, mainly is the time for the effect of control break current feedback signal, holds time and the combination of suitable current feedback signal by suitable, can the current waveform of regulating and controlling lamp current when commutation, thus improve crest factor.
Improve the 3rd embodiment of the method for crest factor in the gaseous discharge lamp
Fig. 8 shows the flow process of the 3rd embodiment of the method for improving crest factor in the gaseous discharge lamp of the present invention.See also Fig. 8, the below is the detailed description to each step in the method for the present embodiment.
Step S30: judge whether electric current commutates, if electric current commutates then enters step S31, otherwise flow process finishes.
Step S31: the judgement signal of sample gas discharge lamp.
Judge that the signals collecting object can be the signal of reflection lamp state, the signal that for example reflects modulating voltage, such as signals such as modulating voltage, circuit duty ratios, it also can be the signal of reflection lamp power, signals such as lamp power, system's input power, system's power output, also can be the count signal (its Counter also comprises timer) of counter, also can be the signal of other reflection lamp states.
Step S32: judge the signal collect and the magnitude relationship of set point, if signal greater than set point then enter step S34, otherwise enters step S33.
In this step, the magnitude relationship judgement current residing stage of gaseous discharge lamp that is actually according to sampled signal and preset value is warm-up phase or permanent power phase.
Because gaseous discharge lamp mainly is comprised of warm-up phase (Warm Up) and two time periods of permanent power phase, the regulative mode in this two stages is different, so need to carry out differentiated treatment to these two stages.
Step S33: select the first parameter.Select the first parameter when gaseous discharge lamp is current to be in warm-up phase judging.
Step S34: select the second parameter.Select the second parameter when gaseous discharge lamp is current to be in permanent power phase judging.
Step S35: closing control unit, i.e. DC to DC converter in the forbidden energy gas discharge lamp circuit.
Step S36: hold time according to selected described the first parameter or the second parameter, wherein the first parameter can be different from the time of forbidding control unit work of the second parameter, also can be identical.
Step S37: enable control unit, namely enable DC to DC converter in the gas discharge lamp circuit according to the time-delay of exporting.
Realization principle corresponding to the step of the present embodiment sees also Fig. 9 A, according to lamp condition selecting parameter 1 or parameter 2 (select parameter 1 when for example lamp state indication gaseous discharge lamp is in warm-up phase, select parameter 2 when lamp state indication gaseous discharge lamp is in permanent power phase).Control turn off current source when lamp current commutates, and under the Restart Signal effect, restart.Its signal schematic representation is shown in Fig. 9 B.
Above-described embodiment provides to those of ordinary skills and realizes or use of the present invention; those of ordinary skills can be in the situation that do not break away from invention thought of the present invention; above-described embodiment is made various modifications or variation; thereby protection scope of the present invention do not limit by above-described embodiment, and should be the maximum magnitude that meets the inventive features that claims mention.
Claims (19)
1. improve the method for crest factor in the gaseous discharge lamp, comprising:
Step 1: the judgement signal of sample gas discharge lamp;
Step 2: judge that according to the magnitude relationship of judging signal and preset value the current residing stage of gaseous discharge lamp is warm-up phase or permanent power phase;
Step 3: according to the default parameter of the residing stage selection of gaseous discharge lamp, when gaseous discharge lamp is in warm-up phase, select the first parameter, when gaseous discharge lamp is in permanent power phase, select the second parameter;
Step 4: when the gas discharge lamp current commutates, export control signal according to selected described the first parameter or described the second parameter, to improve the crest factor of gaseous discharge lamp.
2. improve the method for crest factor in the gaseous discharge lamp according to claim 1, it is characterized in that, described judgement signal is the signal of reflection lamp state or the signal of reflection lamp power.
3. improve the method for crest factor in the gaseous discharge lamp according to claim 2, it is characterized in that, the signal of described reflection lamp state comprises modulating voltage or the circuit duty ratio of gaseous discharge lamp, and the signal of described reflection lamp power comprises the lamp power of gaseous discharge lamp, system's input power or system's power output.
4. improve the method for crest factor in the gaseous discharge lamp according to claim 1, it is characterized in that, step 4 comprises:
According to selected described the first parameter or the second parameter output the second or the 3rd given value of current signal;
Hold time according to selected described the first parameter or the second parameter;
Export the first given value of current signal.
5. improve the method for crest factor in the gaseous discharge lamp according to claim 1, it is characterized in that, step 4 comprises:
According to selected described the first parameter or the second parameter output the second or the 3rd current feedback signal;
Hold time according to selected described the first parameter or the second parameter;
Export the first current feedback signal.
6. improve the method for crest factor in the gaseous discharge lamp according to claim 1, it is characterized in that, step 4 comprises:
DC to DC converter in the forbidden energy gas discharge lamp circuit;
According to selected described the first parameter or the different time-delay of the second parameter output;
Enable described DC to DC converter according to the time-delay of exporting.
7. improve the method for crest factor in the gaseous discharge lamp according to claim 1, it is characterized in that, described judgement signal is the rolling counters forward signal.
8. a gas discharge lamp circuit that improves crest factor comprises DC to DC converter, inverter, judgement signal sample circuit, digital processing chip and control unit, wherein:
Electric current or the watt level of described DC to DC converter control gaseous discharge lamp;
Described inverter couples described DC to DC converter, carries out direct current to the conversion of alternating current;
Described judgement signal sample circuit gathers gaseous discharge lamp and judges signal;
Described digital processing chip, couple described judgement signal sample circuit, judge that according to the magnitude relationship of the judgement signal that samples and preset value the current residing stage of gaseous discharge lamp is warm-up phase or permanent power phase, when being in warm-up phase, gaseous discharge lamp selects the first parameter, when gaseous discharge lamp is in permanent power phase, select the second parameter, when the gas discharge lamp current commutates, export corresponding control signal to described control unit according to selected described the first parameter or the second parameter;
Described control unit couples described digital processing chip, improves the crest factor of gaseous discharge lamp according to described control signal.
9. the gas discharge lamp circuit of improvement crest factor according to claim 8, it is characterized in that comprising power factor correction circuit, described power factor correction circuit, change different input ac voltages into constant or variable direct voltage, described power factor correction circuit output is coupled to the input of described DC to DC converter.
10. the gas discharge lamp circuit of improvement crest factor according to claim 8 is characterized in that, judges the sample output voltage of described direct current, DC converter of signal sample circuit.
11. the gas discharge lamp circuit of improvement crest factor according to claim 8 is characterized in that, judges that signal comprises the signal of reflection lamp state or the signal of reflection lamp power.
12. the gas discharge lamp circuit of improvement crest factor according to claim 10 is characterized in that, described digital processing chip comprises stage judging unit, parameter selection unit, control signal output unit, wherein:
Described stage judging unit judges that according to the magnitude relationship of the output voltage that samples and preset value the current residing stage of gaseous discharge lamp is warm-up phase or permanent power phase;
Described parameter selection unit connects described stage judging unit, selects the first parameter when gaseous discharge lamp is in warm-up phase, selects the second parameter when gaseous discharge lamp is in permanent power phase;
Described control signal output unit connects described parameter selection unit, exports corresponding control signal to described control unit when the gas discharge lamp current commutates according to selected described the first parameter or the second parameter.
13. a gas discharge lamp circuit that improves crest factor comprises inverter, judges signal sample circuit, digital processing chip and control unit, wherein:
Described inverter is controlled electric current or the watt level of gaseous discharge lamp and is carried out direct current to the conversion of alternating current;
Described judgement signal sample circuit gathers gaseous discharge lamp and judges signal;
Described digital processing chip, couple described judgement signal sample circuit, judge that according to the magnitude relationship of the judgement signal that samples and preset value the current residing stage of gaseous discharge lamp is warm-up phase or permanent power phase, when being in warm-up phase, gaseous discharge lamp selects the first parameter, when gaseous discharge lamp is in permanent power phase, select the second parameter, when the gas discharge lamp current commutates, export corresponding control signal to described control unit according to selected described the first parameter or the second parameter;
Described control unit couples described digital processing chip, improves the crest factor of gaseous discharge lamp according to described control signal.
14. the gas discharge lamp circuit of improvement crest factor according to claim 13, it is characterized in that comprising power factor correction circuit, described power factor correction circuit, change different input ac voltages into constant or variable direct voltage, described power factor correction circuit output is coupled to the input of described inverter.
15. the gas discharge lamp circuit of improvement crest factor according to claim 13 is characterized in that, judges the sample duty cycle signals of described inverter of signal sample circuit.
16. the gas discharge lamp circuit of improvement crest factor according to claim 13 is characterized in that, judges that signal comprises the signal of reflection lamp state or the signal of reflection lamp power.
17. the gas discharge lamp circuit of improvement crest factor according to claim 15 is characterized in that, described digital processing chip comprises stage judging unit, parameter selection unit, control signal output unit, wherein:
Described stage judging unit judges that according to the magnitude relationship of the duty cycle signals that samples and preset value the current residing stage of gaseous discharge lamp is warm-up phase or permanent power phase;
Described parameter selection unit connects described stage judging unit, selects the first parameter when gaseous discharge lamp is in warm-up phase, selects the second parameter when gaseous discharge lamp is in permanent power phase;
Described control signal output unit connects described parameter selection unit, exports corresponding control signal to described control unit when the gas discharge lamp current commutates according to selected described the first parameter or the second parameter.
18. the gas discharge lamp circuit of improvement crest factor according to claim 8 is characterized in that, judges the count signal of signal sample circuit sample counter.
19. the gas discharge lamp circuit of improvement crest factor according to claim 13 is characterized in that, judges the count signal of signal sample circuit sample counter.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110201429.3A CN102892247B (en) | 2011-07-19 | 2011-07-19 | The Method and circuits of crest factor is improved in gaseous discharge lamp |
| TW101105283A TWI459861B (en) | 2011-07-19 | 2012-02-17 | Method of improving factor of spike peak of gas discharge lamp and circuit thereof |
| US13/533,671 US8816609B2 (en) | 2011-07-19 | 2012-06-26 | Method and circuit for improving crest factor of gas discharge lamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110201429.3A CN102892247B (en) | 2011-07-19 | 2011-07-19 | The Method and circuits of crest factor is improved in gaseous discharge lamp |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102892247A true CN102892247A (en) | 2013-01-23 |
| CN102892247B CN102892247B (en) | 2016-02-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201110201429.3A Expired - Fee Related CN102892247B (en) | 2011-07-19 | 2011-07-19 | The Method and circuits of crest factor is improved in gaseous discharge lamp |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US8816609B2 (en) |
| CN (1) | CN102892247B (en) |
| TW (1) | TWI459861B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014121662A1 (en) * | 2013-02-08 | 2014-08-14 | 东林科技股份有限公司 | Constant-power supply apparatus and constant-power output control method |
| CN105430854A (en) * | 2015-10-29 | 2016-03-23 | 胡军 | CDM lamp start device and method thereof |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8878453B1 (en) * | 2013-06-13 | 2014-11-04 | Osram Sylvania Inc. | Switch circuit for a ballast |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030062849A1 (en) * | 2001-09-28 | 2003-04-03 | Prasad Himamshu V. | Method and circuit for controlling current in a high pressure discharge lamp |
| CN1156200C (en) * | 1995-12-08 | 2004-06-30 | 皇家菲利浦电子有限公司 | Ballast system |
| US7439690B2 (en) * | 2005-03-04 | 2008-10-21 | Stanley Electric Co., Ltd. | Discharge lamp lighting apparatus and discharge lamp lighting method |
| CN101352107A (en) * | 2005-12-29 | 2009-01-21 | 通用电气公司 | Output short circuit protection for electronic ballasts |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1156200A (en) | 1995-11-14 | 1997-08-06 | 株式会社高雄企业 | Compacting construction method for foundation pouring at present |
-
2011
- 2011-07-19 CN CN201110201429.3A patent/CN102892247B/en not_active Expired - Fee Related
-
2012
- 2012-02-17 TW TW101105283A patent/TWI459861B/en not_active IP Right Cessation
- 2012-06-26 US US13/533,671 patent/US8816609B2/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1156200C (en) * | 1995-12-08 | 2004-06-30 | 皇家菲利浦电子有限公司 | Ballast system |
| US20030062849A1 (en) * | 2001-09-28 | 2003-04-03 | Prasad Himamshu V. | Method and circuit for controlling current in a high pressure discharge lamp |
| US7439690B2 (en) * | 2005-03-04 | 2008-10-21 | Stanley Electric Co., Ltd. | Discharge lamp lighting apparatus and discharge lamp lighting method |
| CN101352107A (en) * | 2005-12-29 | 2009-01-21 | 通用电气公司 | Output short circuit protection for electronic ballasts |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014121662A1 (en) * | 2013-02-08 | 2014-08-14 | 东林科技股份有限公司 | Constant-power supply apparatus and constant-power output control method |
| CN105430854A (en) * | 2015-10-29 | 2016-03-23 | 胡军 | CDM lamp start device and method thereof |
| US10057969B2 (en) | 2015-10-29 | 2018-08-21 | Guangzhou Triz Information Technology Ltd. | Starting device for a CDM lamp and starting method for the same |
| CN105430854B (en) * | 2015-10-29 | 2019-03-19 | 广州萃智信息科技有限公司 | A kind of starter and its method of CDM lamp |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102892247B (en) | 2016-02-10 |
| US20130020966A1 (en) | 2013-01-24 |
| TWI459861B (en) | 2014-11-01 |
| US8816609B2 (en) | 2014-08-26 |
| TW201306664A (en) | 2013-02-01 |
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